## Axioms of a Group

### (1) Closure(2)Associativity(3)Identity(4)Inverse

A group is a mathematical structure consisting of a set G together with a binary operation * that satisfies certain axioms. The axioms of a group are:

Closure: For all a, b in G, the result of the binary operation a * b is also in G.

Associativity: For all a, b, and c in G, the operation (a * b) * c is equal to a * (b * c).

Identity element: There exists an element e in G such that for all a in G, a * e = e * a = a.

Inverse element: For every element a in G, there exists an element b in G such that a * b = b * a = e, where e is the identity element.

These axioms imply several important properties of groups:

Uniqueness of the identity: The identity element e is unique.

Uniqueness of inverses: Each element a in G has a unique inverse element.

Cancellation law: If a * b = a * c, then b = c.

Examples of groups include the set of integers under addition, the set of nonzero real numbers under multiplication, and the set of invertible n x n matrices under matrix multiplication.

The theory of groups is a fundamental area of algebra and has applications in various fields of mathematics, physics, and computer science. Many important mathematical structures, such as rings, fields, and vector spaces, are built on top of the concept of groups.

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